Like the word "organic", "biodegradable" may not mean what you think it means.
Worth Googling the difference between "biodegradable" and "compostable".
I think everything is biodegradable - eventually.

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What happens to the hole when the cheese is gone?
- Bertolt Brecht

True, and like most other things, the amount and concentration matters most.

It's a tough one for me. With all the other things going into the environment, a little Dr. Bronners isn't going to make much difference. But that doesn't mean it's ok. When I pass the cows trashing the stream, upstream from where I'm backpacking, and realize I'm going to feel unsafe even splashing my face with stream water the rest of my trip in the "wilderness", I have a hard time thinking it's "bad" to use some soap. Same with irrigation water runoff from all the fields, with fertilizers etc.

It is "bad", but there are so many things going on that are allowed, which are so much worse for the environment, it's hard to care.

Anyway, most of my outdoor showering is done in the desert, usually miles from the nearest stream. Most of the "natural" soaps recommend 200ft from the nearest water.

As usual it's a matter of "ask the little guy to bend over backwards to be clean, but let the major polluters have a bit of a pass". But again...personal choices. I can choose to be part of the problem or not. A little soap out in the middle of desert isn't a huge concern to me.

I ordered my Casita with an outside shower and have never used it. I even put a quick coupler and one of those stretchy hoses on it. I'm not sure many campgrounds would appreciate showering and soap,shampoo, and water running all over the ground. I have heard some folks use them for washing dishes. Might try mine next time I'm at the beach to rinse off sand and salt. I have some sailors soap I need to try out.

point taken, I guess I didn't think of all the food particles. I usually see a lot of that around the campfire from flaming marshmallows left behind. Mind you I'm in a campground not really off grid. If I were off grid I'd prob. be more concerned around no trace left behind motto. It is definitely something I'm learning about each day reading this blog

We don't have an outside shower. We did rig up a "faucet", from our fresh water drain. When we need water outside, we just fill our container from there, rather than climbing in and out of the trailer.

Keep a cover over the outlet to keep it clean.

We do dish washing and cooking outside. I keep an electric kettle of water going, on a small table we use for dish washing and tea.